Pipe-making machine



Feb. 24, 1925.

' L. A. DUNAJEFF PIPE MAKING MAcHIm-z Filed Feb, 15, 192i 2 sheets-sheet1 INVENTOR.

Feb. 24 1925. @527,729

L., A. DUNAJEFF PIPE MAKING MACHINE v File Febo l5, 1921 2 Sheets-Sheet2 INVENTOR.

Patented Feb. 24, 19:125.

UNITED STATES LEONID A. DUNAJ'EFF, 0F NEW YORK, N. Y.

PIPE-MAKING- MACHINE.

Application led February 15, 1921'. Serial No. 445,127.

To all lwhom t may camera.

, Be it known that I, LnoNin A. DUNAJEFF, citizen of Russia, andresident of New York, in the county of New York and State of New York,have invented certain new and useful action of the centrifugal force,thereby forming a hollow space inside.

T hek objectof my invention is to provide a machine which could be usedfor producing continuously seamless tubin in an sire'd length of anymaterial which cou melted and poured in a rotarymold.'

In the ordinary machines 'for making seamless tubing, the material isusually cast rst into slabs of a certain length, a nd.`after wardsrolled under a very heavy pressure. In my machine I am producing tubingcontinuously casting same in a rotary mold, so limited byI any fixedlength and can produce tubes of a greater length than with othermethods. f My invention is more fully described in the attachedspecification and drawing, in Which f- Fig. 1 is a sectional elevationof my machine, Fig. 2 is a section showing my rotary mold, Fig. 3 is asection showing finishing dbe rolls, Fig. 4 is a sectional view of arotary'4 mclilld, Fig. 5 is a partial view of finishing ro s.

My machine consists of a metal tube 1 lined inside with some 2 which isalso a heat insulator. lGrooves or corrugations 33 help to firmly securethe lining to the mold.

This tube is as shown. A pouring well 3 is located on a separate stand4. The opening 5 in the well 3 is of the same size as the insidediameter of the tube 1. The well is lined inside with some refractorymaterial 6.

The tube 1 has several grooved rings 7 on the outsideand a number ofcooling ribs 8'. The refractory lining 2 does not extend the full lengthof the tube, but ends at some distance from the lower ond of the tube,which' is made slightly tapering or diverging in order to facilitate theextraction of the solidified tubular product.

pipe-making refractory material d placed in an inclined position Thetubular mold 1 rests withV its grooved rings on friction wheels 9mounted on shafts ,110. One of these shafts has a pulley 1 1 with a belt12 connec 'ed with some suitable motor (not shown), and both shafts areconnected together with 14 or with a suitable chain of gears.

This arrangement enables the two shafts l0 to be set in a fast rotarymotion which is communicated through the friction wheels 9 and rings 7to the tu ular mold 1. In order to steady its' movement and to provide anec essary pressure between the frictional surfaces of the wheels 9 andrings 7, pressui c or steadying rings l5 are provided on a separateshaft 16, engaging the same rings 7. The shaft 16 is mounted in slidingbearings springs 18. Screws 19 may be used to regulate the springtension and the amount of pressure between the wheels 15 and the rings7. l

The shafts 10 are supported by bearings K20 in abracket 21 and bearings22I inthe bracket 4.

The bracket 21-supports also bearin s 23 for shafts 24 with rolls 25.These rol s are placed concentrically with the tubular mold and at thesame angle. They approach very closely with their'upper ends the lowerend of the tubular mold. I

These rolls are made hollow and are providedwith a water cooling system.For this purpose pipes 26 are introduced in the openings 27 in the upperend of leach roll. These "pipes are connectedwith a sourcev of a chain13 engaging sprockets running water, and the amount of flow may becftrolled with va ves 28. The water, ue 'f the centrifuggl-forca isthrown against thefinside surface of the rolls, and the excess of itilows-through a pipe 29 introduced through a lower hole 30 in the roll.The holes 27 and 30 are smaller than the inside diameter of the roll, sothat a certain amount of water inside of the rolls ,will be retainedduring their rotation.

In onder to let the' water pass freely fro-ni the upper ends of therolls towardstlieir lower ends, the hubs 31 are provided with numerousholes 32.

The upper ends of shafts I24 have sprockets 25 interconnected with achain 26. One

the'tubulai; mold 1 are set in motion, and their peripheralvelocity willcorrespond to the peripheral velocity of the tube 36.

The operation of my machine is as follows The molten material 34, whichordinarily would be some metal, s poured from a ladle or crucible 35into the pouring well or funnel 3 from which it flows lar mold 3.

The opening -5 is so arranged that the stream of a molten metal willslightly contract inpassing from the well into the mold, therebypreventing any leakage of material in the space between the two. v

The mold is set in a rap-id rotary motion through thewheels 9, pulley 11and belt 12.

'The rotation will produce the centrifugal force, and the molten metal4will be thrown against the inside walls of the mold 3 spreading in alayer and thereby forming a `tube 36. Somewhere in the lower half of themold, the tube will cool off sufiiciently to become solid, andinsuchcondition it. will be caught by the finishing rolls `25. In orderto facilitate the passage of the already hardened tube, the lower end ofthe mold 1. is slightly enlarged, tapering. The rolls are made to rotateall in the same direction and in' accordance with the rotation of themold l, so ythat the tube 3G will be subjected to a rolling pressure ata more or less extended length. This rolling process will bring theoutside diameter of the tube 36 to the exact desired dimension and willalso givev it a smooth finish and a sufficient hardness. The tube at thelower end of the mold is still red hot and comparativel soft, so thattlie centrifugal force will deform itlto to a certain extent, as shownon Figa-3. The rolls however will bring the tube to the exact dimensionand will improve its mechanical qualities.

The tubular product will come out uninterruptedly as long as moltenmetal is being supplied tothe mold, and the finished ,tube may becutinto convenient length bv means of some suitable device, such as acircular saw (not shown), which must have a side movementjn accordancewith the movement ofthe tubular product.

The tube will move out of the mold continuously due to the weight ofthemolten material behind, and for this purpose ,the` mold is set in aninclined position. .In caseswhen this movement should be positivelycontrolled, the rolls 25 may be supplied. with igrooves or corrugations37 arranged'spirally "''w'ith., a suitable pitch. These grooves willdevelop a certain pull on the tube. The

thiclmess o fthe tube is determined by the d ofgmolten material, its

vityytemperature, 'degree of inclination fthe mold and speed of itsrotation. Any

" egularities in the rate of pouring further into the tu'iiii- ,Forinstance, my'machine may be used -to a, liquid form and can and thewalls are made' cooperation with tion with a tubular viscosity,

4uct through the formation of the hollow space inside of the tube. Thetube will therefore come out of the machine in an uninterrupted length,uniform and may be rolled on the outside to the exact diameter. Theprocess is not limited to metals, but any material may be employed,which can be cast, even if it does not possess any suliicient ductilityfor any ordinary process 'of tube manufacturing.

making tubes from glass, lava, quartz, rubber, etc. It may also be-usedin a cold process for such materials which can be reduced be solidifiedafterwards, like gelatinous, gluelike or cement compositions, alsofibrous'and resinous compounds. Y i

I claim as my invention:

1. 'A pipe making machine, the combination with a tubular mold open onboth ends,

a plurality of circular portions on'the outfor side of said ino-ld, aplurality of shafts arranged concentrically with said mold, a pluralityof driving wheels on said shafts in the circular portions o said molds,means to impart a rotary motion to said mold through said drivingwheels, a.

plurality o f guiding wheels in cooperation with said circular portions,and means to press said guiding wheels to said circular portions.

2. A pipe making machine, the combination with a tubular mold open onboth ends, a plurality of circular portions on the outside of said mold,a plurality of shafts concentric with said molddriving wheels on saidshafts in cooperation with the circular members of said mold, means toimparted rotary motion to said mold through said driving wheels, aplurality of rolls arrange concentrically with a tubular `productreceivedfrom said mold, means to impart a 'rotary motion to said rolls,and means to cool off. said rolls.

3. A pipe making machine,

mold open on both ends, means to rotate said mold, a pouring wellstationed near4 one end of said ino1d, a refractory and heat insulatinglining inside of said mold near saidpouring well extending through aportion of the length of said mold', a heat absorbing remaining portionof said mold, a\diverging opening in said mold, and

the` combinasaid diverging opening.

means to extract a tubular prod- 4. A pipe making machine, thecombination with a tubular mold o en on both ends, means to` rotate saidmol a ouring well stationed near one end of saidp mold, a refractory andheat insulating linin extending through a portion of the lengt of saidmold, a heat absorbing remaining portion of said mold, a divergingopening in said mold, cooling devices on the outside of said mold, and aplurality of straightening and finishing devices in a close proximity tosaid mold.

5. In a pipe making machine, the combination with a tubular mold open onboth ends, means to rotate said mold, a refractory lining inside of saidmold extending through a portion of its length and forming a straightcylindrical tubular aperture, a heat absorbing portion of said moldforming a' continuation of said cylindrical aperture, said heatabsorbing portion beine formed with diverging walls forming a ivergingopening, and means to continuously straighten the tubular product fromsaid mold.

6. In a pipe making machine, the combination with a tubular mold open onboth ends, means to rotate said mold, means to introduce a liquidmaterial into one end of said mold, and a 3diverging opening at theother end said diverging opening being of a larger diameter than thefinished product from said liquid material. y

7. In a pipe making machine, the combination with a tubular mold open onboth ends, means to rotate said mold, the main operative portion of saidmold having a straight cylindrical surface inside, means to introduce aliquid material into said main portion of the mold from one end, andmeans to extract a finished roduct from the other e'nd of said mold,said) other end being in `the form of a diverging opening of a largerdiameter than the finished product.

8. In a ipe making machine, the combi,- nation wit a tubular mold openon both ends, means to rotate said mold, means to introduce a liquidmaterial into said mold from one end, said intake end having a straightcylindrical surface inside extendin through the main operative portionof said mold and adapted to form a pipe from said liquid material, andan enlarged diverging opening on the other end of said mold.

9. In a pipe making machine, the combination with a tubular mold open onboth ends, means to introduce a liquid material into said mold, means tosupport said mold in an inclined position at an angle suicient to causea movement of said material and of a finished product through and fromsaid mold, a plurality of rolls adapted to straighten and finish thetubular product from said mold, said rolls being arranged co` axiallywith said mold, and means to introduce a cooling medium inside of saidrolls.

10'. In a pipe making machine, the combination with a tubular mold openon both ends, means to rotate said mold, means to introducel a liquidmaterial into said mold, and a plurality of hollow rolls arrangedcoaxially with the tubular product from said mold and adapted tostraighten and finish said tubular product, means to introduce water inthe upper portions of said hollow rolls, and means to extract said Waterfrom the lower portions ot said rolls.

11. In a pipe making machine, the combination with a tubular mold openon both ends and placed in an inclined position, means to rotate saidmold, an open well placed at the upper end of said mold, an aperture inthe lower portion .of said Well located in opposition to the aperture inthe upper end of said mold, a plurality of comparatively long rollsarranged .concentrically around the tubular product from said mold,means to rotate said rolls, and means to control the extraction of thelinished material from said mold.

Signed at New York, in the county of New York and State of'New York,this 11th day of February, A. D. 1921.

LEON ID .A` DUNAJ EFF.

